How much do you remember about arithmetic? This math problem spotted by Pop Sugar will put your knowledge of high school-level math to the test.
According to YouTube channel MindYourDecisions, the problem (9 – 3 ÷ 1/3 + 1) went viral in Japan after a claim was made that only 60 percent of 20-year-olds could get the correct answer.
Inputting this problem into a calculator won’t work—it will interpret the division incorrectly—so you’ll have to solve it the old-fashioned way to get the right answer. The answer may seem obvious to those who remember to “Please Excuse My Dear Aunt Sally” (a mnemonic device for PEMDAS, the order of operations).
Since there are no parentheses, exponents, or multiplication signs in this equation, the first part you’d tackle is division (3 ÷ 1/3). You should end up with 9, which will bring you to 9-9+1. Next up in the order of operations are addition and subtraction, which are performed from left to right. That should bring you to 0+1, and finally, a grand total of 1.
Did you get it? Common mistakes may lead you to 3, 7, 9, or -1, but try it again with Aunt Sally in mind and you should get the right answer.
To see more math problems like these, check out MindYourDecisions’s YouTube channel.
[h/t Pop Sugar]
More Info: mentalfloss.com